Posted by Wayne Parham [ 70.128.102.225 ] on December 16, 2006 at 09:52:26:
In Reply to: Unity Gain Preamp posted by FredT on December 16, 2006 at 05:06:32:
I think you're exactly right. I've heard a handful of systems with passive "preamp" sections that sounded strained, and I thought they could use a buffer. I didn't take a scope to them - would have been rude to step up and say "sounds like shit, let me bring a scope" - but my guess is the source was overloaded for some reason. It probably was designed for a 47KΩ load and was actually seeing something much less, like maybe 1KΩ or something. A unity gain stage would solve this.
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